It depends on the mysterious magic of the dkpersist setting, we hear; if an item has it, it will survive, and if it doesn't, it will be cast into the outer darkness where there is a weeping and a gnashing of teeth. 1)2)

Here followeth a list. Well, some lists. Make of them what you will.3)

6)
There's a whole page of flavour text! Tasty, tasty canon story. However, most people start to play their character as not entirely losing all memories every single time. The commonest explanation is that over time, or due to accumulating exposure to Improbability, they develop a resistance to the wipe. Or, some people say that they refuse it. Which the Watcher would totally honor.